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Table 16-2 Crystal Resonator Parameters
Frequency (MHz)
Rs max (Ω)
C
(pF)
o
Use a crystal resonator with a frequency equal to the system clock frequency (ø).
Notes on Board Design: When a crystal resonator is connected, the following points should be
noted:
Other signal lines should be routed away from the oscillator circuit to prevent induction from
interfering with correct oscillation. See figure 16-4.
When the board is designed, the crystal resonator and its load capacitors should be placed as close
as possible to the XTAL and EXTAL pins.
Avoid
C
C
488
2
4
500
120
7 pF max
Signal A Signal B
L2
L1
Figure 16-4 Example of Incorrect Board Design
8
10
80
70
(Preliminary)
12
16
60
50
LSI
XTAL
EXTAL
18
40
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